<template>
	<view>
		<my-search @click="gotoSearch"></my-search>
		<view class="scroll-view-container">
			<scroll-view class="left-scroll-view" scroll-y
			:style="{height:wh+'px'}"
			>
			<block v-for="(item,i) in cateList" :key="i">
				<view 
				:class="['left-scroll-view-item',i==active?'active':'']"
				@click="activeChange(i)"
				>{{item.cat_name}}</view>
			</block>
			</scroll-view>
			<scroll-view class="right-scroll-view" scroll-y :style="{height:wh+'px'}" :scroll-top="scrollTop">
				<block v-for="(item2,i2) in activeLevel2" :key="i2" class="cate-lv2">
					<view class="cate-lv2-title">{{item2.cat_name}}</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item"
						 v-for="(item3,i3) in item2.children" 
						 :key="i3"
						 @click="gotoGoodsList(item3)">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cate_name}}</text>
						</view>
					</view>
				</block>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from "@/mixins/tabbar-badge.js"
	export default {
		mixins: [badgeMix],
		data() {
			return {
				// 窗口的可用高度=屏幕的高度-navigator高度-tabbar高度
				wh:0,
				cateList:[],
				activeLevel2:[],
				active:0,
				scrollTop:0
			};
		},
		onLoad(){
			const sysInfo=uni.getSystemInfoSync()
			this.wh=sysInfo.windowHeight-50;		
			this.getCateList();
		},
		methods:{
			async getCateList(){
				const {data:res}=await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status!==200) return uni.$showMsg();
				this.cateList=res.message;
				this.activeLevel2=res.message[0].children;
			},
			activeChange(i){
				this.active=i;
				this.activeLevel2=this.cateList[i].children;
				this.scrollTop=this.scrollTop===0?1:0;
			},
			gotoGoodsList(item){
				console.log(item.cat_id)
				uni.navigateTo({
					url:"../../subpkg/good_list/good_list?cid="+item.cat_id
				})
			},
			gotoSearch(){
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
